BLF hold status not visible on VVX 500

Hello,

          Phonetype : polycom vvx500

          version      :  5.5.0.20556

The problem here is..I have two polycom phones, in one phone i have a monitored user and another i have a BLF line for that user. Even though the monitored user put the call on hold , BLF line for that user still showing solid red bar instead of blinking red. 

I tested with yealink phones ,its perfectly showing blinking red..If this feature is lagging in polycom phones let me know.

Thanking you